.callus {
    width: 1000px;
    height: 600px;
    border: 1px solid red;
    margin: 50px auto;
}

.callus > div:first-child {
    padding: 15px;
    border-bottom: 1px solid red;
    color: #e69137;
    font-size: 20px;
    line-height: 20px;
}

.callus > div:nth-child(2) {
    padding: 15px;
    width: 970px;
    height: 400px;
}
.callus > div:nth-child(3){
    display: flex;
    justify-content: center;
    text-align: center;
    margin: 40px 0 0 0;
}